Valve grinder



F. J. GIBBONS. VALVE GRINDER.. APPLICATION men Au ;.24. 1921.

Patented 0@t.31,11922.

Fallout-,ed @et El,

FRANK J. GIBEONS, 03F WORCESTER, IVISSACHUSETTS.

VALVE G-RXNDER.

Application led August 24. 1921. Serial No. 495,129.

To all wiwi/1, 'it may concer/fi.'

Be it known lthat l. FRANK J. GIBBoNs, a citizen of the United States,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented a new a nd useful Valve Grinder, of whichthe following is a specification.

This invention relatesto a valve grinder designed for use in grindingthe valves of internal combustion engines. ln this operation it isdesirable to give a valve a short oscillatory movement and to constantlychange or advance the field of such movement. This combination ofangular' advance with oscillatory movement has been found best adaptedto produce true surface contact between the valve and its seat.

y lt is the general object of my invention to provide mechanism by whichthis combined movement may be produced in a most etlicient andsatisfactory manner. The reversal of movement is smoothly and easilyaccomplished and the whole mechanism operates Awithout objectionablevibration.

A further object of my invention is to provide means by which the devicemay be readily adapted to furnish a simple rotary movement when desired.j

Vith these general objects in view, an important feature of my inventionrelatesto improved means for producing the'combined angular advance andoscillatory movement. ln the preferred form, this is accomplished by theuse of balls or rollers mounted between driving members havingoppositelymoving bearing surfaces and provided with spaced recesses therein. rlhedisc or carrier for the balls or rollers is fixed on the shaft to beoscillated and receives movement through the` balls or rollers fromrotating. members alternately. 'j j My invention further relates toarrangements and combinations of partspwhich` will be hereinafterdescribed and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which- Fig.1 is a sectional elevation of my improved valve grinder;

Fig. 2 is a detail elevation showing cer-` tain parts in a differentposition;

Fig. 3 is a bottom view of the bearing plate `of the upper drivingmember;

Fig. l is a plan view of the bearing plate of the lower driving member;

Fig. 5 is a plan view of the disc or carrier for the balls or rollers;

Fig. 6 is a partial plan view of a modified form of carrier and roller,and

Fig. 7 is a detail sectional view taken along the line THT in Fig. 6.

Referring to the drawings7 l have shown a valve grinder comprising acasinghaving a Alower portion or frame 10 and a cover 11 secured theretoby binding screws 12. A shaft 13 is rotatable in bushings 14 and 15threaded into the casing members 10 and 11 respectively. l reversiblevalve-engag ing tool 16 is detachably secured in a slot in the lower endof the shaft 13. Binding or lock nuts 17 and 12'a are provided forsecuring the bushings 14 and 15 in adjusted position.

A lower driving member 18 is freely rotatable upon the shaft 13 and isaxially positioned within the casing by the inner end of the bushing 14.An upper driving member 19 is similarly positioned by the inner end ofthe bushing 15. The driving members 18 and 19 are provided with bevelgear teeth oppositely engaging a driving bevel pinion 20 fixed on ashort shaft or stud 21 rotatable in a bearing in the frame 10 and havinga handle 22 secured to the outer end thereof. Manual lmovement of thehandle revolves the driving members 18 and 19 continuously in oppositedirections.

n disc or lcarrier 23 is fixed to the shaft 13 between the drivingmembers 18 and 19 and is provided with recesses 24 (Fig. 5) within whichare seated balls 25. The driving members are preferably provided withhardened steel bearing plates 26 and 27 riveted or otherwise securedthereto. These plates are provided with shallow rounded or cup-likerecesses 28 (Fig. 4) and 29 and 30 (Fig.

The driving members are so adjusted by the bushings 14 and 15 that thereis just sufficient space between the plates 26 and 27 so that a ballseated in one of the recesses in one bearing plate will just clear theflat surface of the other bearing plate.

yThe operation of the mechanism thus far described is as followsc-Assuming that the parts are positioned as shown in Fig. 1, with theballs 25 seated in the recesses 28 of the lbearing plate 26, the lowerdriving member 18 is thus locked to the disc or carrier 23 and the shaftwill be rotated in unison with the angular movement of the member 13.,the balls 25 rolling along the smooth surface of the bearing plate 27between the recesses therein.

Such movement will continue until the balls 25 reach a pair of recesses29 or 30 in the plate 2'?, The resistance of the valve to movement bythe shaft 13 will then cause the balls to shift immediately to therecesses in the plate 2? of the upper driving member, and the lattermember will innnedately' proceed to drive the balls in the oppositedirection, carrying the disc and shaft 13 along with them. As thecircumferential distances between the holes 23 in the plate 26 aregreater than the distances between the holes 29 and 30 in the plate 27,the movements of the disc and shaft in opposite directions are unequaland the field of oscillatory movement is graduallyadvanced. Furthermore,the unequal spacing of the recesses in the plate 27 causes the advancemovements of the' disc and shaft in one direction to be th'lemselvesirregular, thus giving a varied oscillatory advance movement to` thevalve.

It ywill be obvious that suitably tapered rollers may be substituted forthe balls 25 and this alternate construction is indicated in Figs. 6 and7, the construction and operation being otherwisesimilar to thatalreadydescribed.v l

The word roller is it occurs in the claims is understood to cover eitherspherical, cylindrical or tapered rolling elements.

lt is sometimes desirableA to continuously rotate the shaft 13 and forthis purpose l provide the driving member 19 with axial grooves 31 (Fig.3) adapted to receive balls 32 mounted in cross openings near the upperend of the shaft 13. The shaft is recessed to receive a plunger 33having a `groove 3ft, a shoulder 35 and a head 36. The upper end of theshaft 13 is notched orrecessed at 37 to receive a cross pin 38 in theplunger 33 and the plunger is provided with a knurled end 39 by which itmay be moved.

Vilhcn the plunger 33 is fully inserted, as shown in l, the drivingmember 19 is free to rotate on the shaft 13 as the balls 32 arereceivedin the groove 34 and do not project beyond the surface of the shaft 13.A t this time the cross pin 38 is seated in the notches 37.

V] hen the plunger' 33 pulled upward, the balls -32 will be forcedAoutwardly by `the shoulderf35, entering the .groovesl in the drivingmembergl and locking the 'latter to thevshaft i3. vThe plunger may beheld in this position by turning the' cross. pin so that it'cannot enterthe notches 3T. The head 36- of the plunger prevents further withdrawal`thereof and thus preventsdisplacement ofthe parts. When the shaft 13 istobe drivencontinuously, `the bushingr le is moved outward sufficientlyto allow the balls 2d to roll freely between the bearing plates `26 and27.

It will thus appear that I have provided a valve ginder capable ofproducing an advancing irregular oscillatory movement with the use ofvery few and simple moving parts.

Having thus described my invention, it will beevident that changes andmodifications may be made therein by those slrilled in the art withinthe spirit and scope thereof as forth in the claims and ll. do not wishto be otherwise limited to the details herein disclosed but what I claimist--` 1. A. valve grinder.comprising a casing, a shaft rotatablymounted in said casing, a pair of driving members freely rotatable onsaid shaft and having recesses in their adjacent bearing faces, means tocontinuously rotate said driving members in opposite directions, aroller, and a carrier therefor fixed to said shaft between said drivingmembers, said roller entering the recesses in the two driving membersalternately and thus connecting said carrier and shaft to said membersalternately.

2. A valve grinder comprising a casing, a shaft rotatably mounted insaid casing, a pair of driving members freely rotatable on said shaftand having recesses in their adjacent bearing faces, means tocontinuously rotate said driving members in opposite d irections, a pairof rollers, and a carirer therefor fixed to said shaft between saiddriving members, said rollers entering recesses in said driving membersalternately and` thus alternately forming driving connections betweeneach member and said carirer.

3. A. valve grinder comprising a casing, a shaft `rotatably mounted insaid casing, a pair of driving members freely rotatable on said shaftand having recesses in their adjacent bearing faces, means tocontinuously rotate said driving members in opposite directionse acarrier iiXed tosaid shaft between said driving members, and devices onsaid carrier adapted to enter said recesses and form driving connectionswith said members, the circunflferentiai` spacing of the recesses Vinone of said members "being greater .than the circumferentialspacing intheother member; whereby the ii'eld of oscillation is graduallyadvanced. i y l 4. A valve grinder comprising a casing, a shaftrotatablymounted in said casing, a pair of Adrivingmeinbers freelyVrotatable on said `Shaftandhaving recesses 'intheir ad jacent bearingfaces, meansto continuously rotate said driving membersinoppositeldirectio'ns, a carrierXed to said `shaft 'between said`driving members, 'and devices on Said carrier adapted Y.to venter(saidrecesses vand form driving connections'with said membersfthelcircumferential spacing of thefrecesses n one f 'said membersbe'ngunequal,

rac

laaaeea whereby the oscillatory movements in one direction are unequalin extent.

5. A valve grinder comprising a casing, a shaft rotatably mounted insaid casing, a pair of driving members freely rotatable on said shaftand having recesses in their adjacent bearing faces, means tocontinuously rotate said driving members in opposite directions, aroller, a carrier therefor fixed to said shaft between said drivingmembers, said roller alternately connecting said carrier and shaft todifferent driving members, and means to connect said shaft positively toone of said driving members.

(S. valve grinder comprising a casing, a shaft; rotatably mounted insaid casing, a pair ol" fflriving members freely rotatable on saidshaft; and having recesses in their adjacent liiearing faces, means tocontinuously Votate said driving members in opposite directions, aroller, a carrier therefor iiXed to said shaft between said drivingmembers,

said roller alternately connecting said carrier and shaft to differentdriving` members, and one of said driving members having axial groovestherein, locking balls in said shaft, and means to force said ballsoutwardly into said grooves to lock said drivin member to said shaftr. Avalve grinder comprising a easing, a shaft rotatably mounted in saidcasing, a pair of driving gears freely rotatable on `said shaft, meansto continuously rot-ate said gears in opposite directions, a memberfixed to said shaft between said gears, and means to connect said memberto said gears alternately and to hold said parts connected for unequal.periods of rotation in one direction, thereby producing unequal advance.movements in one direction.

In testimony whereof l have hereunto affixed my sigiiature,

FRANK J. GIBBONS.

